package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    /**
     * 新增菜品
     *
     * @param dishDTO
     */
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {

        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        // 向菜品表插入1条数据
        dishMapper.insert(dish);

        Long dishId = dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
            // 向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    /**
     * 菜品分页查询
     *
     * @param dishPageQueryDTO
     * @return
     */
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());

        Page<DishVO> dishVOPage = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(dishVOPage.getTotal(), dishVOPage.getResult());
    }

    /**
     * 菜品批量删除
     *
     * @param ids
     */
    @Transactional
    public void deleteBatch(List<Long> ids) {
        // 判断当前是否能够删除--是否存在起售中的菜品
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);

            if (dish.getStatus() == StatusConstant.ENABLE) {
                // 当前菜品处于起售中，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        // 判断当前是否能够删除--是否被套餐关联
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDushIds(ids);
        if (setmealIds != null && setmealIds.size() > 0) {
            // 当前菜品被套餐关联了，不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        // 删除菜品表中的菜品数据
        dishMapper.delByIds(ids);

        // 删除菜品关联的口味数据
        dishFlavorMapper.delByIds(ids);

    }

    /**
     * 启售停售
     *
     * @param status
     * @param id
     */
    public void startOrStop(Integer status, Long id) {
        Dish dish = new Dish();
        dish.setStatus(status);
        dish.setId(id);
        dishMapper.update(dish);
    }

    /**
     * 根据id查询菜品
     *
     * @param id
     * @return
     */
    public DishVO getById(Long id) {
        // 根据id查询菜品数据
        Dish byId = dishMapper.getById(id);

        // 根据菜品id查询口味数据
        List<DishFlavor> dishFlavor = dishFlavorMapper.geiByDishId(id);

        // 将查询到的数据封装到dishVO
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(byId, dishVO);
        dishVO.setFlavors(dishFlavor);

        return dishVO;
    }

    /**
     * 修改菜品
     *
     * @param dishVO
     */
    public void update(DishVO dishVO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishVO, dish);

        // 修改菜品表基本信息
        dishMapper.update(dish);
        // 删除原有口味
        Long dishId = dish.getId();
        dishFlavorMapper.delByIds(Collections.singletonList(dishId));

        List<DishFlavor> flavors = dishVO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            for (DishFlavor flavor : flavors) {
                flavor.setDishId(dishId);
            }
            // 向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 根据分类id查询菜品
     *
     * @param id
     * @return
     */
    public List<Dish> getByCategoryId(Long id) {
        List<Dish> getByCategoryId = dishMapper.getByCategoryId(id);

        return getByCategoryId;
    }

    /**
     * 用户端条件查询菜品和口味
     *
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> list = dishMapper.listWithFlavor(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : list) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d, dishVO);

            List<DishFlavor> dishFlavors = dishFlavorMapper.geiByDishId(d.getId());

            dishVO.setFlavors(dishFlavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}
